var xmlHttp = createXmlHttpRequestObject();

//confirm(createXmlHttpRequestObject());

var showErrors = true;
 
var cache = new Array();

var global_cislo = 0;



function createXmlHttpRequestObject() 
{

  var xmlHttp;

  try
  {
   
    xmlHttp = new XMLHttpRequest();
  }
  catch(e)
  {
 
    var XmlHttpVersions = new Array("MSXML2.XMLHTTP.6.0",
                                    "MSXML2.XMLHTTP.5.0",
                                    "MSXML2.XMLHTTP.4.0",
                                    "MSXML2.XMLHTTP.3.0",
                                    "MSXML2.XMLHTTP",
                                    "Microsoft.XMLHTTP");
  
    for (var i=0; i<XmlHttpVersions.length && !xmlHttp; i++) 
    {
      try 
      { 
       
        xmlHttp = new ActiveXObject(XmlHttpVersions[i]);
      } 
      catch (e) {} 
    }
  }

  if (!xmlHttp)
    alert("Error creating the XMLHttpRequest object.");
  else 
    return xmlHttp;
}


function displayError($message)
{
  if (showErrors)
  {
    showErrors = false;
   
    alert("Error encountered: \n" + $message);
  }
}



function startup()
{
  	Sortable.create("prilohy_pole", {tag:"li"}); 
  	
	if(document.getElementById("kos"))
	{
	  Droppables.add("kos", 
	  {
		    onDrop: function(element) 
		    {
			      var deleteTask = 
			                    confirm("Chcete polozku smazat?")
			      if (deleteTask)
			      {
			        Element.hide(element);
			        process("smazat_prilohu",element.id);
			      }
		    }
	  });
	}   
}


function serialize(listID)
{
  var length = document.getElementById(listID).childNodes.length;
  var serialized = "";

  for (i = 0; i < length; i++)
  {

    var li = document.getElementById(listID).childNodes[i];

    var id = li.getAttribute("id");
 
    serialized += encodeURIComponent(id) + "_";
  }
  		return serialized.substring(0, serialized.length - 1);
}

function vyprazdnit(id)
{
	document.getElementById(id).innerHTML = '';
}

function process(action,id)
{ 
    params = "";
	
    if(action == "pridej_fotku")
    {
    	if(document.getElementById("adresa_fotky").value!="")
    	{
		    	global_cislo=action;
		    	
			    var adresa_fotky = "&adresa_fotky=" + document.getElementById("adresa_fotky").value;
			    var foto_slozka = "&foto_slozka="+document.getElementById("foto_slozka").value;
			    var cislo_vlozeni = "&cislo_vlozeni="+id;
			    var autor = "&autor="+document.getElementById("autor").value;
			    var popisek = "&popisek="+document.getElementById("popisek").value;
			    
			    params = "?akce="+action + adresa_fotky + foto_slozka + popisek + autor + cislo_vlozeni;	
			    	      
			    loader = document.getElementById('vypis_fotek');
			    loader.innerHTML += "<li>...nahravam fotku...</li>";
			    
			    document.getElementById("adresa_fotky").value="";
			    document.getElementById("popisek").value="";
		    	document.getElementById("stavovy_radek").innerHTML="";
		}
		else
		{
			document.getElementById("stavovy_radek").innerHTML="<div class='stavovyRadek'>neni vybrana zadna fotka</div>";
		}
    }
    
     
 
//////////////////////////////////////////////////////////////////////////////////////////////////   
    if (params) cache.push(params);
    try
    {
	      if ((xmlHttp.readyState == 4 || xmlHttp.readyState == 0)&& cache.length>0)
	      {
	        var cacheEntry = cache.shift();

		      	xmlHttp.open("GET", "moduly/fotky/spojovac_ajax_php.php" + cacheEntry, true);
	
		        xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
		        xmlHttp.onreadystatechange = handleRequestStateChange;
		        xmlHttp.send(null);
      	  }
	      else
	      {
	        setTimeout("process();", 1000);  
	      }
    }
    catch (e)
    {
      displayError(e.toString());
    }
}

function handleRequestStateChange() 
{
	
  if (xmlHttp.readyState == 4) 
  {
    if (xmlHttp.status == 200) 
    {
      try
      {
        postUpdateProcess();
      }
      catch(e)
      {
        displayError(e.toString());
      }
    } 
    else 
    {
      displayError(xmlHttp.statusText);
    }
  }
}


function postUpdateProcess() /// funkce vraci do html data z PHP pres AJAX
{
  var response = xmlHttp.responseText;

  
 	if(global_cislo=='pridej_fotku')
 	{
 		document.getElementById("vypis_fotek").innerHTML = response;
 	}
	
} 

function handleKey(e) 
{

  e = (!e) ? window.event : e;
       
  code = (e.charCode) ? e.charCode :
         ((e.keyCode) ? e.keyCode :
         ((e.which) ? e.which : 0));
     
  if (e.type == "keydown") 
  {
    if(code == 13)
    {
      process("txtNewTask", "addNewTask");
    }
  }
}

function trim(s)
{
  return s.replace(/(^\s+)|(\s+$)/g, "")
}